| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 101 === This study is examined the amorphization behavior of the Cu-Ti-Zr-based alloy powders with 10 at% Zr (99.0 at% purity) synthesized by mechanical alloying technique. The compositions of the alloys were near the eutectic compositions in the Cu-Ti-Zr ternary phase diagram by CALPHAD technique. As the results demonstrated , the ternary Cu-Ti-Zr alloys of compositions ranging from Cu-50-80 at% , Ti-10-40 at% and 10 at% Zr were not found to exhibit a glass transition temperature(Tg). By addition of silicon to the Cu60Ti30Zr10 system , some amorphous powders were found to exhibit a wide supercooled liquid region before crystallization. The temperature interval of the supercooled liquid region (ΔTx) and the activation energy of crystallization (Ec) are 76K , 221.7 kJ/mole for （Cu60Ti30Zr10）99Si1 and 84.7K , 237.8 kJ/mole for （Cu60Ti30Zr10）97Si3 , respectively . Finally , small additions of Si significantly improved the glass forming ability of the Cu-Ti-Zr-based amorphous alloys.
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